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Fixed assets, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fixed assets [Abstract]    
Fixed assets $ 18,199 $ 21,451
Less: Accumulated depreciation and amortization (16,736) (19,979)
Fixed assets, net 2,684 1,950
Tooling, Machinery and Equipment [Member]    
Fixed assets [Abstract]    
Fixed assets 6,694 9,508
Furniture and Office Equipment [Member]    
Fixed assets [Abstract]    
Fixed assets 1,660 1,706
Computer Software and Equipment [Member]    
Fixed assets [Abstract]    
Fixed assets 6,973 7,364
Leasehold Improvements [Member]    
Fixed assets [Abstract]    
Fixed assets 2,872 2,873
Fixed Assets, Excluding Construction in-Process [Member]    
Fixed assets [Abstract]    
Fixed assets, net 1,463 1,472
Construction in-Process [Member]    
Fixed assets [Abstract]    
Fixed assets $ 1,221 $ 478